World soil resources and food security
editor, Rattan Lal, B.A. Stewart
CRC Press, 2012
Buku Teks
World resources : a guide to the global environment
Allen L. Hammond [and others]
Oxford University Press , 1996
Buku Teks
A world between
George Braziller, 1999
Buku Teks
World water balance and water resources of the earth
Unesco, 1978
Buku Referensi
Water resources management: A World Bank Policy Paper
Washington The World Bank 1993,
Buku Teks
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